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JPH06315195

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH06315195
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker for use in various audio equipment, and more particularly to a speaker for achieving
small size and high performance.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to the
drawings.
[0003]
FIG. 7 is a half sectional view showing the structure of a conventional general speaker, in which a
lower plate 25 having a center pole 25a, a ring-shaped magnet 26, and a ring-shaped upper plate
27 are stacked and coupled to each other. The frame 30 is coupled to the upper surface of the
magnetic circuit 29, and the diaphragm 32 is coupled to the peripheral portion of the frame 30
together with the gasket 31. A voice coil 33 fitted without eccentricity in a magnetic gap 28
formed in the circuit 29 is coupled, a bobbin middle portion of the voice coil 33 is supported by a
damper 34, and a dust cap is provided on the upper surface of the central portion of the
diaphragm 32. It was constructed by pasting 35.
[0004]
In addition to the general speaker shown in FIG. 7, a speaker having a small size and high
performance as shown in FIG. 8 has also been put to practical use.
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[0005]
That is, the conventional speaker for achieving the small size and high performance shown in
FIG. 8 is a pot type yoke 36 having a center pole 36 a and a ring shaped rare earth coupled
radially on the inner wall of this yoke 36 and magnetized. The magnetic circuit 39 having the
magnetic gap 38 formed by the magnet 37 of the magnetic system is configured, and by using
the rare earth magnet 37 having high energy in the radial direction and using it, the small size,
light weight and high performance can be obtained. The magnetic circuit 39 is configured, and
the frame 30, the diaphragm 32 and the like described in FIG. 7 are incorporated in the magnetic
circuit 39.
[0006]
However, in the speaker having the above-described conventional configuration, the temperature
of the voice coil 33 tends to rise when a large input is continuously applied to the speaker, and in
particular, the size and performance are improved as shown in FIG. In the speaker using the
magnetic circuit 39 aimed at, a large input is added as the performance is enhanced, so that the
temperature rise of the voice coil 33 becomes remarkable as compared with the conventional
general speaker shown in FIG.
[0007]
Furthermore, since the speaker magnetic circuit 39 shown in FIG. 8 is miniaturized, the surface
area of the magnetic circuit 39 is small, and the heat generated by the temperature rise of the
voice coil 33 is dissipated through the magnetic circuit 39. In the worst case, there is a problem
that the voice coil 33 can not withstand the temperature rise and is broken.
[0008]
The present invention solves the above-described conventional problems, and aims to provide a
speaker capable of suppressing an abnormal temperature rise of a voice coil and achieving stable
performance even in a speaker achieving downsizing and high performance. It is
[0009]
SUMMARY OF THE INVENTION In order to solve the above problems, a loudspeaker according to
the present invention comprises a pot-shaped yoke having a center pole and a ring-shaped rare
earth coupled radially on the inner wall of the yoke and magnetized radially. A magnetic circuit
having a magnetic gap constituted by a magnet of the system, a radiation fin fitted to an outer
peripheral portion of the magnetic circuit and provided with a plurality of projecting pieces on a
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peripheral edge, a frame coupled to an upper portion of the magnetic circuit; The voice coil to be
fitted into the magnetic gap is coupled to the center and the outer peripheral portion is coupled
to the peripheral portion of the frame, or the heat dissipating fin is integrally formed with the
yoke.
[0010]
With this configuration, the radiation fin which is fitted to the outer peripheral portion of the
magnetic circuit and provided with a plurality of projecting pieces at the peripheral edge radiates
the temperature rise of the magnetic circuit due to the temperature rise of the voice coil, thereby
reducing the size and weight Even if the temperature of the voice coil rises abnormally by adding
a large input to the speaker using the magnetic circuit, the heat dissipation effect is obtained by
the heat dissipation fins, and the magnetic circuit does not rise to the abnormal temperature, and
the voice coil is also constant. As the temperature rises only, reliability can be improved.
[0011]
In addition, the radiation fins do not become large by efficiently setting their shape and number,
and they do not impair the features of the small-sized, lightweight, high-performance speaker.
[0012]
Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with
reference to the drawings.
[0013]
FIG. 1 is a half sectional view showing the structure of a loudspeaker according to the
embodiment, in which 1 is a pot type yoke having a center pole 1 a and 2 is a ring shaped
magnet coupled to the upper inner wall of this yoke 1. The magnetic circuit 4 is formed by
forming a magnetic gap 3 with the center pole 1a using a rare earth magnet magnetized in the
radial direction.
[0014]
Denoted at 5 are heat dissipating fins, which are provided with a plurality of projecting pieces 5a
at their peripheral edges and fitted in the outer peripheral portion of the yoke 1 described above.
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The reference numeral 6 denotes a frame connected to the upper part of the magnetic circuit 4
and the reference numeral 7 denotes a diaphragm for connecting a voice coil 8 to the central
part. The voice coil 8 is fitted into the magnetic gap 3 without eccentricity.
9 is a damper for supporting the diaphragm 7, 10 is a dust cap attached to the central upper
surface of the diaphragm 7, and 11 is a gasket attached to the periphery of the diaphragm 7.
[0015]
FIG. 2 is a perspective view showing the speaker according to the present embodiment shown in
FIG. 1. The speaker of the present invention thus configured is a magnetic circuit 4 using a rare
earth magnet 2 having high energy. The input of the voice coil 8 is larger than that of a general
speaker.
[0016]
However, even if the temperature of the voice coil 8 rises with the increase in input power, and
the raised temperature raises the temperature of the magnetic circuit 4, the plurality of
protrusions 5a provided on the radiation fin 5 fitted in the magnetic circuit 4 Because the
temperature raised by the heat dissipation is dissipated, the temperature of the voice coil 8 does
not rise above a certain value.
Therefore, the occurrence of a problem due to the abnormal temperature rise of the voice coil 8
is eliminated, stable performance is exhibited, and a highly reliable speaker can be obtained.
[0017]
FIGS. 3 (a) to 3 (d) show an example of the above-mentioned heat dissipating fins 5. The heat
dissipating fins 5 are made of a material with good thermal conductivity such as copper,
aluminum, iron, zinc alloy etc. The optimum shape and size may be set according to the size, the
temperature of the voice coil 8 which is increased by the applied input, and the like, and the
present invention is not limited to FIGS. 3 (a) to 3 (d). It goes without saying that any
configuration can be used as long as it can dissipate the temperature rise of the voice coil 8 and
the magnetic circuit 4.
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[0018]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
[0019]
FIG. 4 is a half sectional view showing the configuration of the loudspeaker according to the
embodiment, in which the radiation fin 5 of the first loudspeaker described with reference to
FIGS. 1 to 3 is integrally formed with the yoke 1, In FIG. 4, reference numeral 12 denotes a pot
type yoke, and the yoke 12 has a center pole 12a and a plurality of projecting pieces 12b
integrally formed on the peripheral edge. A magnetic circuit 13 in which the magnetic gap 3 is
formed is configured by coupling the ring-shaped rare earth magnet 2.
[0020]
The configuration in which the frame 6 is coupled to the upper portion of the magnetic circuit 13
and the diaphragm 7, the voice coil 8 and the like are incorporated is the same as that of the first
embodiment, and thus the detailed description will be omitted.
[0021]
The speaker according to the present invention configured as described above not only has the
effect of suppressing the abnormal temperature rise of the voice coil as described in detail in the
first embodiment, but also makes the heat dissipating fins integral with the yoke. Thus, the
number of parts and the number of assembling steps can be reduced, and the cost can be
reduced as compared with the first embodiment.
[0022]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
[0023]
FIG. 5 is a half sectional view showing the configuration of the loudspeaker according to the
embodiment. In the loudspeaker according to this embodiment, the magnetic circuit of the
loudspeaker described in the first and second embodiments is disposed and coupled to the front
side of the loudspeaker In general, it is called a reverse cone type or a reverse magnetic circuit
type.
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[0024]
In FIG. 5, reference numeral 14 denotes a pot type yoke having a center pole 14a, and 15
denotes a ring-shaped magnet coupled to the upper inner wall of the yoke 14, using a rare earth
magnet magnetized in the radial direction. A magnetic circuit 17 in which a magnetic gap 16 is
formed of 14 and a magnet 15 is configured.
Denoted at 18 is a radiation fin provided with a plurality of projecting pieces 18a at its
peripheral edge, and is fitted to the outer peripheral portion of the yoke 14.
[0025]
A convex support 19 has the magnetic circuit 17 screwed to the convex portion, and the inner
peripheral portion of the frame 20 is screwed to the flange portion at the lower end.
A diaphragm 21 has an outer peripheral portion coupled with the gasket 24 to the peripheral
portion of the frame 20, and is coupled around the voice coil 22 which is fitted without
eccentricity to the magnetic gap 16, and further the damper 23 Support the
[0026]
The speaker according to the present invention configured as described above achieves a
reduction in thickness by arranging and coupling the magnetic circuit 17 to the front side of the
speaker and using a rare earth magnet 15 for the magnetic circuit 17 in a compact and high
performance manner. It is possible to obtain a large input by achieving a large input, and the
effect that the abnormal temperature rise of the voice coil 22 can be suppressed by the effect of
the radiation fin 18 even if the large input is added.
[0027]
Further, since the projecting pieces 18a of the heat dissipating fins 18 are disposed on the front
surface of the diaphragm 21, they also function as an equalizer for controlling the frequency
characteristics of the speaker, and the heat dissipating fins 18 have frequency characteristics
shown in FIG. In the present invention, in which the radiation fin 18 is attached and the effect of
the equalizer is also obtained as compared with the conventional product without the noise, the
output level of the reproduced sound pressure becomes high particularly in the middle to high
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frequency range. The function as the above-mentioned equalizer is further improved by
increasing the thickness or the number to increase the density, or by providing the projecting
pieces 18a integrally with the entire periphery of the heat radiation fin 18.
[0028]
In the above embodiment, the radiation fin 18 is fitted on the outer periphery of the yoke 14.
However, the present invention is not limited to this, and the radiation fin 18 may be integrally
formed with the yoke 14. Not too.
[0029]
As described above, the speaker according to the present invention can dissipate the abnormal
temperature rise of the voice coil and the temperature rise of the magnetic circuit generated
when a large input is applied to the speaker by the radiation fin. The abnormal temperature rise
of the voice coil can be suppressed.
Therefore, it is possible to add a large input to the voice coil even in a smaller, lighter or thinner
speaker, and it is possible to realize high performance with the large input of the speaker.
[0030]
Furthermore, in the case of a speaker having a configuration in which the magnetic circuit is
disposed and coupled to the front side of the speaker, the heat radiation fin can perform the
function of an equalizer, so that the sound quality can be improved. It is possible to obtain a
speaker with improved and excellent frequency characteristics.
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